Is the music from your iPhone sounding a little lifeless? The Vamp could bring your audio back from the dead with a built-in headphone amplifier and digital-to-analog converter (DAC) that bypasses the iPhone's audio circuitry.
Designed for Apple's iPhone 4 and 4S, the Vamp is also a very solid-looking case that's made from "aircraft-grade metal." Inside, there's a high-quality DAC and two 150mW amps (at 32 omhs) to drive headphones of various sizes. A rechargeable 2,200mAh battery powers the setup for up to 8 hours, which isn't very impressive for a high-end headphone amp.
It also serves as a backup battery for your iPhone, which will undoubtedly leave you with even fewer hours of music. … Read more